/*
 * Copyright [2013-2021], Alibaba Group Holding Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.alibaba.polardbx.optimizer.core.rel;

import com.alibaba.polardbx.optimizer.index.Index;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.logical.LogicalFilter;
import org.apache.calcite.rel.logical.LogicalProject;
import org.apache.calcite.rel.metadata.RelMetadataQuery;

/**
 * @author dylan
 */
public interface MysqlRel {
    Index canUseIndex(RelMetadataQuery mq);

    static Index canUseIndex(RelNode rel, RelMetadataQuery mq) {
        if (rel instanceof MysqlRel) {
            return ((MysqlRel) rel).canUseIndex(mq);
        } else if (rel instanceof LogicalProject) {
            return canUseIndex(((LogicalProject) rel).getInput(), mq);
        } else if (rel instanceof LogicalFilter) {
            return canUseIndex(((LogicalFilter) rel).getInput(), mq);
        } else {
            return null;
        }
    }
}
